Cyber Resilience

CVE-2026-8458

Haxx Curl 7.46.0 – 8.20.0

Public PoC
Published
03 July 2026
Modified
07 July 2026
Patch / advisory
View advisory
CVSS Score v3.1 6.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS Score 0.0054 43th percentile
Risk Priority 51 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-8458 is a medium-severity an unspecified weakness vulnerability in Haxx Curl. Its CVSS base score is 6.5 (Medium).

Operationally, ranked at the 43th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection…

more

to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.

CWE(s)
NVD-CWE-noinfo

Related Threats

CVEs Like This One

CVE-2026-5773Same product: Haxx Curl
CVE-2025-15079Same product: Haxx Curl
CVE-2024-0853Same product: Haxx Curl
CVE-2026-3784Same product: Haxx Curl
CVE-2026-3805Same product: Haxx Curl
CVE-2026-10536Same product: Haxx Curl
CVE-2025-14819Same product: Haxx Curl
CVE-2026-11586Same product: Haxx Curl
CVE-2025-15224Same product: Haxx Curl
CVE-2026-8926Same product: Haxx Curl

Affected Assets

haxx
curl
7.46.0 — 8.20.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References